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Whitepunk [10]
3 years ago
12

A) Expand and simplify. 7(x - 2) - 2(x - 1) b) Factorise fully. 8x2 + 6x

Mathematics
1 answer:
cluponka [151]3 years ago
5 0

Answer:

a).  5x - 12   b). 2x(4x + 3)

Step-by-step explanation:

a). 7(x - 2) - 2(x - 1)

= 7x - 14 - 2x + 2

= 5x - 12

b). 8x² + 6x

2x(4x + 3)

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The A+ Cell Company charges $40 per month and $0.30 per minute for each additional minute over 500 minutes. The cost can be writ
adelina 88 [10]

Answer:

up 10

Step-by-step explanation:

The function would change from

C(x) = 0.3x + 40

to

C(x) = 0.3x + 50

The change is only to the y-intercept, so the graph of the function will move up 10.

8 0
2 years ago
You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the a
svetoff [14.1K]

Answer:

n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663

So the answer for this case would be n=2663 rounded up to the nearest integer

Step-by-step explanation:

We have the following info:

ME = 50 margin of error desired

\sigma = 1000 the standard deviation for this case

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =50 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

The critical value for 99% of confidence interval now can be founded using the normal distribution. The significance is \alpha=0.01. And for this case would be z_{\alpha/2}=2.58, replacing into formula (b) we got:

n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663

So the answer for this case would be n=2663 rounded up to the nearest integer

5 0
2 years ago
A six-sided number cube is weighted so that the number do not all have the same probability of landing up
Jobisdone [24]

Answer:

Ok so if this is a question then the probalility will probably be 1/3 for three of the 6 sides.

Step-by-step explanation:

3 0
2 years ago
HELP PLEASE I NEED THIS FOR GRADUATION
Alexxandr [17]
√324 * √75 = √24300 = 90√3
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answer is
D. last one 10√3 irrational
8 0
3 years ago
45633 seconds en heures minutes et seconds
Sever21 [200]
Yes. I totally agree with that statement. 10/10
3 0
3 years ago
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